[LinuxPPS] [PATCH]

[Bernhard Schiffner]

On Saturday 02 February 2008 11:30, Udo van den Heuvel wrote:

> So we'd have to cook up a refclock_nmea patch if this works.
> I'll have a look and try.
Good luck!
It will help definitely. NMEA+PPS-refclock is something worthy (may be it is 
already implemented in similar way but with other name).

If you program it:
Please organize a feature ("flag") for hardware-shift the receiver and 
calculate this shift back again. (until 1 ms, perhaps similar to cable delay)  
That's IMHO the only way to use multiple PPS-receivers. In normale case all 
PPS-receivers start their interrupt the same time (within µs!) and the 
computer is "busy" with the interrupt occured first. It takes the 
computer "long" time (>=50µs) to recovcer.

> Maybe first enable some NMEA stuff to see the amount of sats.
> Next we'd like to set an absolute minimum for a dependable PPS..
>
> OK, we're getting offtopic w.r.t. LinuxPPS.
>
Don't think so.
This discussion broaden our view and helps design the right interface.
PPS is not alone in doing the time-job.

Bernhard